Breaks after upgrade to ruby 3.1.4

[tsankaste]

I am trying to upgrade ruby from 3.0.3 to 3.1.4. I am using syck (1.4.1) as default yaml parser.

There were recent breaking changes for Psych, it is now using #safe_load by default.
https://bugs.ruby-lang.org/issues/17866
ruby/psych@1764942